My 6 month baby used to put herself to sleep, i would put her in her cot, say night night and close the door behind me and she would go to sleep. Recently i tried giving her naps in another room, in another cot (because we are going on holiday soon and she'll have a different cot for a week) but now she just cries and cries. I have brought her back to her original cot and room but now she wont sleep like she used to, she just cried and cried. Please help.